GNU screen does not support truecolor escape sequences. When pi emits
truecolor SGR sequences (e.g. \x1b[38;2;102;102;102m for the dim color
#666666), screen misparses the semicolon-separated parameters as
individual SGR codes. The RGB value 102;102;102 maps directly to
SGR 102 (bright green background), which then bleeds into every
subsequent \x1b[2K line-erase, producing a bright green background
on most info/status messages.
detectColorMode() now returns '256color' for any TERM value that is
'screen', starts with 'screen-' (e.g. screen-256color), or starts
with 'screen.' (e.g. screen.xterm-256color). The existing COLORTERM
check at the top of the function already handles the opt-in case for
users who have configured screen's truecolor passthrough.
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